I am new to Rune, to Raspberry Pi, and to Linux, but hope to become literate. I have just set up my system with Version 0.22-4-2 on a Raspberry Pi 4, connected via USB to a Moon DAC which is connected via RCA to a NAD receiver. My music library (which shows up perfectly in the Rune web interface) is in a separately powered hard drive connected to the Pi via USB 3.0. The 7" touch screen shows Rune controls (albeit anamorphically but that is not really the big problem here) and a strong wifi connection enables me to see and adjust settings via laptop and my iPhone. The MPD settings are:
# cat /etc/asound.conf
# aplay -l | grep ^card
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
card 2: DAC [USB Audio DAC], device 0: USB Audio [USB Audio]
# amixer scontrols
Simple mixer control 'PCM',0
I have rebuilt the library several times and rebooted repeatedly. But when I press the play button nothing happens (it does not transform itself into the Pause button) and of course, no sound comes out.
What have I missed? I feel it must be something basic that would be obvious to an experienced user.
I would be grateful for any diagnostic tools and suggestions for bringing my system to life.